Her name is Imogen Heap, and she is and has been my favourite artist the last year. You should REALLY check her/or her band "Frou Frou" out.
https://youtube.com/watch?v=pSIbfzK2spg
This song is from the movie "The holiday" with Cameron Diaz and Jack Black. And she also has a song in "Narnia", "Shrek 2" and "Garden State"
The album "Frou Frou - Details" is a must have
[/me being a girly]
I just HAD to let it out...